Method for recording sound employing a separate source of electrical energy



July 11, 1933.

s. c. WHITMAN 1,917,280

METTHOD FOR RECORDING SOUND EMPLOYING A SEPARATE SOURCE OF ELECTRICAL ENERGY Filed Ju ne so, 1930 5 Sheets-Sheefi 1 8 Batten 51+ Bauer? +Y lNVErjTOR Wlutmra Stewart 61 ATTORNEYS 51+ Batter July 11, 1933. s. c. WHITMAN, 1,917,280

METTHOD FOR RECORDING SOUND EMPLOYING A SEPARATE SOURCE OF ELECTRICAL ENERGY Filed June 30, 1930 3 Sheets-Sheet 2 B L Battery Stewart 6'.

' y. ATTORNEYS as BY' ATTORN July 11, s Q wHlTMAN METTHOD FOR RECORDING SOUND EMPLOYING A SEPARATE SOURCE OF ELECT RICAL ENERGY Filed June 30, 1930 3 Sheets-Sheet 3 Stewart '0.

|NVENTO R WIZLt IZG/IZ/ EYS Patented Ja 11, 1933 "UNI- E STATES P T NT OFFICE f on NEW YORK, N. Y., ASSIGNOR or ONE-HALF r GEORGE .SI-IAGKELFORD, or NEwYonK, N, Y.

mn'rnon non momma sounn EMFLQYING A streams sermon on ELECTRICAL ENERGY i glassan these electrical light Application filed June 30,

My invention relates to a method of recording soundsphotographically using a separate source of electrical energy. This sepai'ate source of electrical energy, may be used for sound recording on photo-sensitized motion picture film and maybe used in the productlon of phonograph sound records and the reproduction of sound records. It also may immediately beadopted in connection with the projection andreception of teleyision when or wherever a separate source of electrical energy" is required to relieve the ampl fi f o ib e us d as p w ptheart of recording on sensitized motion picture film, saidseparate source of electrical energy adds to the faithful reproduction of sound, covering the iull band of 'musical frequencies in conjunctionwith the use of said separate source of electricalenergy. I u e a pe l t e c t e of my invention for recording to handle the output of said separate source of electrical energy.

T isseis scia ypes. te designs of r ing containersare constructed to handle the output of said separate sourceofiel-ectrica-1 energy. I have, in my experiments, used the en psed t pe. 9f ocai e-Wh h s d of n'some cases, have used a chamriibber the like-haying one end closed and. the other end open to allow the passage of air and light. I have also used discharges in a compressed air contalner. When used in a compressed air container, I find that I get afmor'e perfect blue light discharge which givesbetter resultsfor the adaptation of photographic'reproduction, Furthermore, I find that I get an almost perfect blue light discharge,

When I use the'open end chamber, Ifind in my experiments of machination, thatusinga light discharge in acompressed air container and also using it in anfiopenend container wherethe air can getto it, the aforesaid light discharge has more penetrating valuation for photograph- ;ifc reproduction. Ijhaye also used this, said light discharge in a Vacuum container with be]: or container made of bakelite,j fiber,

1930. Serial at. 465,025,

Very good results. I have triedseveral different kinds and mixtures of gases such as argon; helium and neon with fair results, There are many types of contacts and many methods thatmay be employed in connection with saidlight discharge,such as anodes and charge against it and pass said electrical light impulsesthrough said slit or aperture causing a superfine light line to be transmitted by exposure to the photo-sensitized motion picture film.

Figure 1 1s "a schematic diagram representseparate source of electrical energy with its output. i 1

Figure'3 represents still another schematic diagram of a sound recording amplifier with 'ing the output of a sound amplifierhaving a Figure 2 represents anothers'chematic diagram of another form of sound recording a separate source ofelectrical energy with its output. I l 1 Figure 4represents a sound ampllfier and a separate source 0t electrical energy using a high tension spark coil showing its output making contact witha suitable slit, using the slit as" one of the contacts, and alens combination of a photo-sensitized motion picture high'tensionspark coil showing its output enclosed a 1n 1 a container, enclosing the electri- Figure 5 represents asoundamplifier and a separate source of electrical energy,ius1ng cal light discharge, through a cylindrical lens held against a'photo-sensitized film by ajsprin'gyand suitable slit. 1.

Figure6 1s apartial sectionalview of an electrical high frequency or high tension elec trical discharge containerenclosed. Figure-7 1s a partlalsect onal View ofan electrical high frequency, or hlgh tension electrical discharge container open at one 1f, i i i through the several views.

Figure 8 is a partial sectional view of an electrical high frequency, or high tension electrical discharge container enclosed with an electrical contact outside the enclosure.

Figure 9 is a partial sectional View of a high tension, or high frequency electrical discharge container showing the elements therein.

Figure 10 is still another partial sectional view of a further form of high tension or high frequency electrical discharge container showing the elements therein.

Figure 11 is a partial sectional View showing an open high tension spark gap.

Figure 12 is a similar view showing an enclosed high tension-spark gap.

The same part is designated by the same reference characters wherever it occurs In order to record my method on a photosensitized motion picture film, the sound amplifier 1 receives on its input "side modulated high frequency impulses and these sound impulses are passed from the output of said sound amplifier 1 and are then passed to a separate source of electrical energy, as shown at 2 andwhile at this point the sound impulses are impressed on suitable coils,

' transformers, chokes, and the like as shown at 3. Various conventional forms of electrical hook-ups, circuits and means are shown in Figures 1, 2,8, 4 and 5 in the accompanying drawings.

The impulses when impressed on the aforesa1d separate source of electrical energy as disclosed in Figures 1 to 5, inclusive cause an electrical light discharge to take place at 6, as shown also in Figures 1 to 5, inclusive. Thiselectrical light discharge is used to expose a photo-sensitized I motion picture film on a suitable location on the film 7 shown in Figures 3, 4 and 5. When these sound impulses do not pass the source 2-there is no electrical light discharge at 6 and consequently there is no exposure on said photo-sensitized motion picture film 7 This is due to the separate source of electrical energy furnishingthe power for the electrical light discharge from a separate source of electrical energy as shown at 2 and there is no direct connection between the sound recording light 6.and the sound amplifier 1, there is no steady flow of audio-frequency electrical impulses and as the said separate source of electrical energy is a high frequency electrical energy, the said audio-frequency sound impulses are used only to control andf modulate high frequency light discharges. Thus these light discharges are used to expose a photo-sensitized motion pic- 1 picture film adjacent to a motion picture.

I also show in said co-pending application, a sound track covering the full width inside the sprocket holes on a photo-sensitized mo tion picture film.

In Figure 40f the drawings, I have shown the lamp 6 in association with an adjustable slit 8 and lens elements 9 arranged in order forward of the film 7. ,In Figure 5 of the drawings, I have illustrated the lamp 6 in association with a lens element 9 held forward of a slit 8 just forward of the film 7. Various forms of lens elements and slits may be used in carrying out my invention, both of the forms herein shown in Figures 4 and 5 being illustrated in my ,copending application, Serial No. 465,024. 5

In Figures 6 to 12, inclusive, I have shown various lamp forms which may be used in the output of the separate source of energy. Any of these forms of lamps may be used.

In Figure 6, I have shown an enclosed type,

samebeing of the enclosed type having an;

inner electrode 15. An outer band is designated by the numeral 16 having the wire 17 leading thereto. I

. In Figure 9, a form is shown of the enclosed and open type in combination, the outer bulb being designated by the numeral 18. Within the bulb is an open shell 19 having the electrode 20 therein. Leading from the shell 19 are the two contacts 21 and 22.

In Figure 10, I have shown a still :further modification of the enclosed type in which the bulb is designated by the numeral 28. Therewithin is an open shell 24 lined as shown at 25. A central electrode is designated by the numeral 26 and an outer elec trode isdesignated by the. numeral 27, the latter extending around and'bent inwardly through the open end of the shell 24 and havingcontact with the inner lining 25 adj acent its outer end.

modification in which the shell is designated by the numeral 28 having an opening 29 in the front thereof. Electrodes 30 and 31 project inwardly from the sides of the shell 28, said electrodes respectively leading from In Figure 11', I have shown a still further i the wires 32 and 33 which are supported in the sides of the shell 28 through the medium of the bearings or the like 34.

In Figure 12, I haveshown a still further modification inwhich the lamp bulb is of the" enclosed type, said bulb being designated by the numeral 35. A pair of wires 36 and 37 extend longitudinally in the bulb and have their outer ends bent inwardly toward one another as shown at 38 the free ends of same being spaced to form the gap 39.

Various other modifications and changes in details and various changes in electrical hook-up and designs of containers and elements and various ways and means for electrio light discharges will occur to those skilled in the art without departing from the spirit and scope of my invention as defined in the claim.

Having thus described my invention, what I claim is:

An apparatus for producing a highly actinic light for recordingpurposes comprising a high frequency mechanical buzzer, in-

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